OLED Display Corner-Cube Pattern for Reflection Management
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Solution Overview
Problem
OLED displays suffer from reduced visibility in bright environments due to external light reflection, which affects the expression of black color and contrast.
Innovation Solution
The implementation of a corner-cube pattern on the second substrate, which reflects incident light back in a direction parallel to the incident light, combined with a gap or filler of lower refractive index between the substrates, minimizes external light reflection and enhances light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional OLED display structure is used, then the display can be manufactured with standard processes, but external light reflection deteriorates visibility and contrast in bright environments
Solution Approach 1:
The patent applies the corner-cube pattern which reflects incident external light back toward its source direction, converting the harmful reflection into a beneficial effect by directing reflected light away from the viewer's line of sight. This geometric optical structure transforms the problem of light reflection into a solution that maintains display visibility in bright environments.
Solution Approach 2:
The corner-cube pattern is applied specifically to the second substrate (cover lens or protective layer) rather than the entire display structure. This localized application targets the specific interface where external light enters and reflects, providing anti-reflection functionality only where needed while maintaining standard manufacturing processes for the rest of the OLED structure.
2Object-affected harmful factors
If the corner-cube pattern is added to reduce reflection, then visibility is improved, but the device structure becomes more complex
Solution Approach 1:
The corner-cube pattern is implemented as a periodic array of discrete micro-structures on the second substrate rather than a continuous complex coating. Each corner-cube element is a simple geometric feature that can be manufactured using standard photolithography and etching processes, making the overall complex function achievable through repetition of simple units.
Solution Approach 2:
The patent replaces complex multi-layer anti-reflection coatings or liquid crystal-based glare reduction systems with a passive geometric optical structure. The corner-cube pattern uses simple geometric reflection principles rather than complex mechanical or electronic control systems, reducing overall device complexity while achieving the visibility improvement.
3Object-affected harmful factors
If a gap with gas or filler is introduced between substrates, then light reflection is minimized through refractive index matching, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the refractive index parameter of the medium between the corner-cube pattern and the OLED structure by introducing a gas-filled gap or low-refractive-index filler material. This parameter change optimizes light transmission by reducing reflection at the interface, leveraging optical physics principles to improve visibility without adding complex structural elements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves visibility by reducing external light reflection and maintaining minimal light loss, thereby enhancing the display's contrast and power efficiency.
Implementation Method 1
The corner-cube pattern may be configuerd to reflect incident light back in a direction substantially parallel to a direction of the incident light
Implementation Method 2
a refractive index of the second substrate may be greater than a refractive index of the gas... a refractive index of the filler may be less than a refractive index of the second substrate
Data Source
AI summary
An OLED display includes a first substrate including a thin film transistor and an OLED, and a second substrate on the first substrate and including a corner-cube pattern facing the first substrate.